D3437: Implementation of biological control of air potato in Louisiana

The air potato vine (Dioscorea bulbifera L.), native to Asia and Africa, has invaded disturbed and natural areas in southeastern USA resulting in displacement of native species and reduction of biodiversity. The biological control agent, Lilioceris cheni Gressitt and Kimoto (Chrysomelidae) was initially released in Florida (2012) and later in Louisiana (2016) to help manage air potato. This research aimed to: 1) assess factors affecting L. cheni establishment, and 2) Quantify beetle impact in selected sites in Louisiana. Laboratory studies showed that different beetles biotypes respond differently to high temperatures commonly found in summer months in Louisiana. In addition, flooding conditions reduced pupal survival and adult overwintering ability in outdoor cages. Long-term post-release studies demonstrated that L. cheni can establish in south and central Louisiana, but reduction of air potato stands varied among sites and years. Long-term studies such as this are critical when evaluating the efficacy of biological control programs.